Steel Temporary Pedestrian Bridge Modular Steel Bridges 1.5m 2.134m Panel Height

Temporary Steel Pedestrian Bridge/temporary Steel Modular Bridge

Common protective coatings used for steel bridges include several types of multi-layer systems designed to provide long-lasting protection against corrosion and environmental degradation. Here are the most widely used coating systems:

1. **Zinc-Rich Primer Coatings**:
   - **Inorganic Zinc (IOZ)**: These primers use zinc metal powder mixed with an inorganic silicate binder. They provide excellent cathodic protection and are often used in highly corrosive environments, such as coastal areas.
   - **Organic Zinc (OZ)**: These primers contain zinc metal pigment mixed with organic resins like epoxy or polyurethane. They are easier to apply and cure compared to inorganic zinc primers.

2. **Three-Coat Systems**:
   - **Zinc-Rich Primer**: Provides sacrificial protection to the steel.
   - **Epoxy Midcoat**: Adds thickness and durability, enhancing the barrier properties against moisture and corrosive agents.
   - **Polyurethane or Fluoropolymer Topcoat**: Provides UV resistance, weather protection, and excellent gloss and color retention. Fluoropolymer-based topcoats, such as those using FEVE (fluoroethylene vinylether), offer superior durability and longevity.

3. **Metallizing and Galvanizing**:
   - **Metallizing**: Involves applying a layer of zinc or a zinc-aluminum alloy to the steel surface using thermal spraying. This method provides excellent corrosion protection and can be further enhanced with a sealer and polyurethane topcoat.
   - **Hot-Dip Galvanizing**: Immersing steel structures in molten zinc to form a protective coating. This method offers superior corrosion resistance and has the highest practical maintenance times, often exceeding 70 years in moderately corrosive environments.

4. **Weathering Steel**:
   - **Uncoated Weathering Steel**: Contains small amounts of alloying elements like copper, nickel, chromium, and silicon. These elements form a protective patina that adheres tightly to the surface and provides corrosion resistance. However, this method is less effective in highly corrosive environments and may require additional coatings or thickness.

5. **Alkyd Systems**:
   - These systems are less commonly used due to their lower protection levels compared to zinc-based coatings. They typically consist of alkyd-based primers and topcoats and are suitable for less aggressive environments.

The choice of coating system depends on factors such as the environment, expected durability, and life-cycle costs. Zinc-rich primers and multi-coat systems with polyurethane or fluoropolymer topcoats are widely used for their robustness and long service life.

Specifications:

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CB321(100) Truss Press Limited Table
No.	Lnternal Force	Structure Form
		Not Reinforced Model				Reinforced Model
		SS	DS	TS	DDR	SSR	DSR	TSR	DDR
321(100)	Standard Truss Moment(kN.m)	788.2	1576.4	2246.4	3265.4	1687.5	3375	4809.4	6750
321(100)	Standard Truss Shear (kN)	245.2	490.5	698.9	490.5	245.2	490.5	698.9	490.5
321 (100) Table of geometric characteristics of truss bridge(Half bridge)
Type No.	Geometric Characteristics	Structure Form
		Not Reinforced Model				Reinforced Model
		SS	DS	TS	DDR	SSR	DSR	TSR	DDR
321(100)	Section properties(cm3)	3578.5	7157.1	10735.6	14817.9	7699.1	15398.3	23097.4	30641.7
321(100)	Moment of inertia(cm4)	250497.2	500994.4	751491.6	2148588.8	577434.4	1154868.8	1732303.2	4596255.2

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CB200 Truss Press Limited Table
NO.	Internal Force	Structure Form
		Not Reinforced Model				Reinforced Model
		SS	DS	TS	QS	SSR	DSR	TSR	QSR
200	Standard Truss Moment(kN.m)	1034.3	2027.2	2978.8	3930.3	2165.4	4244.2	6236.4	8228.6
200	Standard Truss Shear (kN)	222.1	435.3	639.6	843.9	222.1	435.3	639.6	843.9
201	High Bending Truss Moment(kN.m)	1593.2	3122.8	4585.5	6054.3	3335.8	6538.2	9607.1	12676.1
202	High Bending Truss Shear(kN)	348	696	1044	1392	348	696	1044	1392
203	Shear Force of Super High Shear Truss(kN)	509.8	999.2	1468.2	1937.2	509.8	999.2	1468.2	1937.2

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CB200 Table of Geometric Characteristics of Truss Bridge(Half Bridge)
Structure	Geometric Characteristics
	Geometric Characteristics	Chord Area(cm2)	Section Properties(cm3)	Moment of Inertia(cm4)
ss	SS	25.48	5437	580174
	SSR	50.96	10875	1160348
DS	DS	50.96	10875	1160348
	DSR1	76.44	16312	1740522
	DSR2	101.92	21750	2320696
TS	TS	76.44	16312	1740522
	TSR2	127.4	27185	2900870
	TSR3	152.88	32625	3481044
QS	QS	101.92	21750	2320696
	QSR3	178.36	38059	4061218
	QSR4	203.84	43500	4641392

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Advantage

Possessing the features of simple structure,
convenient transport, speedy erection
easy disassembling,
heavy loading capacity,
great stability and long fatigue life
being capable of an alternative span, loading capacity